Kewanee STP and Collection System - Municipal Wastewater Treatment in Kewanee, Illinois

Kewanee STP and Collection System is a municipal wastewater treatment facility located at 374 North Fisher Avenue in Kewanee, Illinois, a city in Henry County. The plant serves a population of about 14,143 people, placing it in the small-to-medium agglomeration category for U.S. wastewater infrastructure. As a U.S. facility, the plant operates under the Clean Water Act's National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. For plants of this scale, secondary treatment is typically required to reduce organic matter and suspended solids before discharge. The treated effluent from the plant is discharged into a local water body that eventually drains into the Illinois River basin, a major tributary of the Mississippi River. This watershed supports diverse aquatic life and provides drinking water for downstream communities. Proper treatment helps maintain the ecological health of the receiving waters.

The plant discharges into a receiving water body within the Illinois River basin, which flows into the Mississippi River and ultimately the Gulf of Mexico. This watershed supports a variety of fish and wildlife, including migratory birds along the Mississippi Flyway. Effective wastewater treatment is critical to prevent nutrient pollution that can contribute to hypoxia in the Gulf of Mexico.